This is a preliminary report of previously collected data. This report is pulling information on all Northeast Silver hake stocks.

Methods

General methods

Northeast stocks were identified from NOAA/EDAB ECSA seasonal species strata.

Data sources for each analysis are identified in the Results.

All continuous temporal data were plotted against time. If there were 30 or more years of data, a geom_gls regression line was fit (yellow = significant increase; purple = significant decrease; no line = no significant trend). If there were fewer than 30 years of data, no regression was fit.

assessmentdata methods

Stock assessment and data quality information were compiled into a summary table.

B/Bmsy was classified as “DANGER” if it was below 1 and “GOOD” if it was above 1.

F/Fmsy was classified as “DANGER” if it was above 1 and “GOOD” if it was below 1.

survdat methods

survdat data with zero abundance were not included in this analysis. Abundance and biomass were summed for each year and season. All other metrics were averaged for each year and season. The tables show summary statistics for the entire time series and for the most recent 5 years in the time series.

Results

Indicator time series

Latitude and longitude

Latitude and longitude ranges were compiled from NOAA/EDAB ECSA seasonal species strata and Bottom Trawl Survey (BTS) shapefiles. The coordinate system is WGS84.

Region Season Lat_min Long_min Lat_max Long_max Warning
Southern Georges Bank / Mid fall -75.66 35.5 -65.68 42.08 none
Southern Georges Bank / Mid spring -75.66 35.5 -65.68 42.08 none
Gulf of Maine / Northern Georges Bank fall -70.67 41 -65.57 44.49 none
Gulf of Maine / Northern Georges Bank spring -70.67 41 -65.57 44.49 none

Stock assessment and data quality information

Stock assessment and data quality information were pulled from assessmentdata::stockAssessmentSummary.

Species Region Assessment Year Last Data Year Biological Data Rating (2019) Biological Data Rating (before 2019) Size Data Rating Ecosystem Linkage Data Rating FSSI status Review Result
146 Silver hake Gulf of Maine / Northern Georges Bank 2005 2004 NA 2 NA NA Y Full acceptance
147 Silver hake Gulf of Maine / Northern Georges Bank 2011 2009 NA 2 NA NA Y Accept previous approach, remand new attempt
148 Silver hake Gulf of Maine / Northern Georges Bank 2014 2013 NA 2 NA NA Y Full acceptance
149 Silver hake Gulf of Maine / Northern Georges Bank 2017 2017 NA 2 NA NA Y Full acceptance
150 Silver hake Southern Georges Bank / Mid-Atlantic 2005 2004 NA 2 NA NA Y Full acceptance
151 Silver hake Southern Georges Bank / Mid-Atlantic 2011 2009 NA 2 NA NA Y Accept previous approach, remand new attempt
152 Silver hake Southern Georges Bank / Mid-Atlantic 2014 2013 NA 2 NA NA Y Full acceptance
153 Silver hake Southern Georges Bank / Mid-Atlantic 2017 2017 NA 2 NA NA Y Full acceptance

B/Bmsy

B/Bmsy data were pulled from assessmentdata::stockAssessmentSummary.

The most recent status of B/Bmsy is: GOOD, DANGER

Figure

Data

F/Fmsy

F/Fmsy data were pulled from assessmentdata::stockAssessmentSummary.

The most recent status of F/Fmsy is: GOOD, GOOD

Figure

Data

Revenue

Commercial catch data were downloaded from NOAA FOSS.

Figure

Data

Recruitment

Recruitment data were pulled from assessmentdata::stockAssessmentData. Separate geom_gls() functions were fit for each region; trend lines are only shown when the trend was statistically significant, so some plots may have fewer trend lines than regions.

Figure
## [1] "NO DATA"
Data

Diet

Diet data were compiled from existing data. For analysis, all geographic samples were grouped by season, year, and region, and only year-season-region combinations with more than 20 predators sampled were considered. Prey items that made up more than 5% of the predator’s diet in at least one year-season-region were identified to the broad category level; all other prey are grouped into the “other” category.

Figure

Summary
Prey category Season Region Mean proportion +- SD (n years) Range
ANIMAL_REMAINS FALL Gulf of Maine / Northern Georges Bank 0.018 +- 0.04 (39) 0 - 0.256
ANIMAL_REMAINS FALL Outside stock area 0.02 +- 0.036 (31) 0 - 0.19
ANIMAL_REMAINS FALL Southern Georges Bank / Mid 0.023 +- 0.018 (41) 0 - 0.087
ANIMAL_REMAINS SPRING Gulf of Maine / Northern Georges Bank 0.02 +- 0.027 (39) 0 - 0.154
ANIMAL_REMAINS SPRING Outside stock area 0.033 +- 0.046 (30) 0.001 - 0.188
ANIMAL_REMAINS SPRING Southern Georges Bank / Mid 0.024 +- 0.027 (41) 0 - 0.12
ANIMAL_REMAINS SUMMER Gulf of Maine / Northern Georges Bank 0.004 +- 0.004 (8) 0 - 0.011
ANIMAL_REMAINS SUMMER Outside stock area 0.012 +- 0.016 (7) 0 - 0.046
ANIMAL_REMAINS SUMMER Southern Georges Bank / Mid 0.008 +- 0.011 (2) 0 - 0.016
ANIMAL_REMAINS WINTER Outside stock area 0.004 +- 0.002 (2) 0.002 - 0.005
ANIMAL_REMAINS WINTER Southern Georges Bank / Mid 0.024 +- 0.024 (16) 0.002 - 0.082
ANNELIDA FALL Gulf of Maine / Northern Georges Bank 0 +- 0 (12) 0 - 0.001
ANNELIDA FALL Outside stock area 0.012 +- 0.031 (10) 0 - 0.1
ANNELIDA FALL Southern Georges Bank / Mid 0.009 +- 0.029 (16) 0 - 0.117
ANNELIDA SPRING Gulf of Maine / Northern Georges Bank 0.001 +- 0.002 (11) 0 - 0.005
ANNELIDA SPRING Outside stock area 0.003 +- 0.004 (9) 0 - 0.014
ANNELIDA SPRING Southern Georges Bank / Mid 0.001 +- 0.001 (19) 0 - 0.004
ANNELIDA SUMMER Gulf of Maine / Northern Georges Bank 0 +- 0 (2) 0 - 0
ANNELIDA SUMMER Outside stock area 0.008 +- 0.005 (3) 0.002 - 0.012
ANNELIDA WINTER Southern Georges Bank / Mid 0.002 +- 0.003 (5) 0 - 0.006
ARTHROPODA FALL Gulf of Maine / Northern Georges Bank 0.343 +- 0.29 (42) 0.017 - 1
ARTHROPODA FALL Outside stock area 0.199 +- 0.173 (37) 0.011 - 0.786
ARTHROPODA FALL Southern Georges Bank / Mid 0.2 +- 0.124 (41) 0.031 - 0.591
ARTHROPODA SPRING Gulf of Maine / Northern Georges Bank 0.378 +- 0.26 (40) 0.048 - 0.931
ARTHROPODA SPRING Outside stock area 0.333 +- 0.26 (36) 0.03 - 0.913
ARTHROPODA SPRING Southern Georges Bank / Mid 0.187 +- 0.132 (41) 0.025 - 0.709
ARTHROPODA SUMMER Gulf of Maine / Northern Georges Bank 0.351 +- 0.29 (8) 0.118 - 0.999
ARTHROPODA SUMMER Outside stock area 0.275 +- 0.225 (7) 0.063 - 0.738
ARTHROPODA SUMMER Southern Georges Bank / Mid 0.033 +- 0.014 (2) 0.024 - 0.043
ARTHROPODA WINTER Outside stock area 0.466 +- 0.095 (2) 0.399 - 0.533
ARTHROPODA WINTER Southern Georges Bank / Mid 0.146 +- 0.102 (16) 0.015 - 0.356
FISH FALL Gulf of Maine / Northern Georges Bank 0.649 +- 0.283 (41) 0 - 0.982
FISH FALL Outside stock area 0.76 +- 0.192 (37) 0.094 - 0.985
FISH FALL Southern Georges Bank / Mid 0.688 +- 0.155 (41) 0.241 - 0.884
FISH SPRING Gulf of Maine / Northern Georges Bank 0.601 +- 0.263 (40) 0.062 - 0.951
FISH SPRING Outside stock area 0.636 +- 0.267 (36) 0.071 - 0.94
FISH SPRING Southern Georges Bank / Mid 0.637 +- 0.187 (41) 0.059 - 0.97
FISH SUMMER Gulf of Maine / Northern Georges Bank 0.721 +- 0.158 (7) 0.481 - 0.882
FISH SUMMER Outside stock area 0.59 +- 0.333 (7) 0.018 - 0.932
FISH SUMMER Southern Georges Bank / Mid 0.957 +- 0.027 (2) 0.937 - 0.976
FISH WINTER Outside stock area 0.531 +- 0.097 (2) 0.462 - 0.599
FISH WINTER Southern Georges Bank / Mid 0.544 +- 0.25 (16) 0.171 - 0.885
MOLLUSCA FALL Gulf of Maine / Northern Georges Bank 0.013 +- 0.017 (19) 0 - 0.067
MOLLUSCA FALL Outside stock area 0.037 +- 0.049 (20) 0.001 - 0.161
MOLLUSCA FALL Southern Georges Bank / Mid 0.097 +- 0.084 (36) 0.003 - 0.312
MOLLUSCA SPRING Gulf of Maine / Northern Georges Bank 0.002 +- 0.002 (3) 0 - 0.004
MOLLUSCA SPRING Outside stock area 0.009 +- 0.01 (6) 0 - 0.022
MOLLUSCA SPRING Southern Georges Bank / Mid 0.163 +- 0.132 (38) 0.005 - 0.653
MOLLUSCA SUMMER Gulf of Maine / Northern Georges Bank 0.027 +- 0.043 (4) 0.002 - 0.092
MOLLUSCA SUMMER Outside stock area 0.838 +- NA (1) 0.838 - 0.838
MOLLUSCA SUMMER Southern Georges Bank / Mid 0.003 +- NA (1) 0.003 - 0.003
MOLLUSCA WINTER Southern Georges Bank / Mid 0.285 +- 0.205 (16) 0.036 - 0.641
OTHER FALL Gulf of Maine / Northern Georges Bank 0.002 +- 0.005 (19) 0 - 0.023
OTHER FALL Outside stock area 0.001 +- 0.001 (4) 0 - 0.002
OTHER FALL Southern Georges Bank / Mid 0.001 +- 0.002 (23) 0 - 0.008
OTHER SPRING Gulf of Maine / Northern Georges Bank 0.001 +- 0.001 (16) 0 - 0.003
OTHER SPRING Outside stock area 0.002 +- 0.004 (10) 0 - 0.012
OTHER SPRING Southern Georges Bank / Mid 0.002 +- 0.003 (24) 0 - 0.01
OTHER SUMMER Gulf of Maine / Northern Georges Bank 0 +- 0 (3) 0 - 0
OTHER SUMMER Outside stock area 0 +- 0 (2) 0 - 0
OTHER SUMMER Southern Georges Bank / Mid 0 +- NA (1) 0 - 0
OTHER WINTER Southern Georges Bank / Mid 0.003 +- 0.003 (5) 0 - 0.008
Data

Temperature

Surface and bottom temperature data were pulled from survdat.

Figures

Separate geom_gls() functions were fit for fall and spring measurements; trend lines are only shown when the trend was statistically significant, so some plots may have fewer than two trend lines. Fall has solid trend lines, and spring has dashed trend lines. Please note, sometimes the survey observed a small number of fish outside of the defined stock area.

Summary
Surface temperature
Season Region Mean value +- SD (n years) Mean value +- SD (past 5 years) Range (total) Range (past 5 years)
FALL Gulf of Maine / Northern Georges Bank 11.93 +- 1.3 (57) 13.27 +- 0.51 (5) 8.62 - 14.36 12.47 - 13.75
FALL Outside stock area 13.7 +- 2.3 (57) 14.91 +- 1.31 (5) 7.66 - 17.24 12.98 - 16.66
FALL Southern Georges Bank / Mid 17.59 +- 2.25 (57) 18.84 +- 2.33 (5) 9.41 - 20.7 14.78 - 20.36
SPRING Gulf of Maine / Northern Georges Bank 5.64 +- 1.25 (52) 7.44 +- 1.7 (5) 3.61 - 10.1 5.58 - 10.1
SPRING Outside stock area 5.9 +- 1.77 (52) 7.55 +- 1.79 (5) 2.69 - 11.69 6.41 - 10.73
SPRING Southern Georges Bank / Mid 6.64 +- 0.96 (52) 7.67 +- 1.16 (5) 4.97 - 9.57 6.46 - 9.57
SUMMER Gulf of Maine / Northern Georges Bank 16.41 +- 0.75 (6) 16.81 +- 0.95 (3) 15.71 - 17.44 15.71 - 17.44
SUMMER Outside stock area 18.29 +- 1.54 (6) 17.72 +- 1.8 (3) 16.55 - 20.06 16.55 - 19.79
SUMMER Southern Georges Bank / Mid 20.62 +- 1.7 (3) 20.62 +- 1.7 (3) 18.65 - 21.63 18.65 - 21.63
WINTER Gulf of Maine / Northern Georges Bank 4.24 +- NA (1) 4.24 +- NA (1) 4.24 - 4.24 4.24 - 4.24
WINTER Outside stock area 3.76 +- 1.23 (3) 3.76 +- 1.23 (3) 2.5 - 4.95 2.5 - 4.95
WINTER Southern Georges Bank / Mid 6.78 +- 0.88 (15) 6.87 +- 0.92 (5) 5.53 - 7.97 5.7 - 7.96
Bottom temperature
Season Region Mean value +- SD (n years) Mean value +- SD (past 5 years) Range (total) Range (past 5 years)
FALL Gulf of Maine / Northern Georges Bank 8.33 +- 0.85 (57) 9.36 +- 0.37 (5) 6.09 - 9.69 8.75 - 9.69
FALL Outside stock area 11.94 +- 2.62 (57) 13.05 +- 1.88 (5) 5.5 - 15.98 10.22 - 15.52
FALL Southern Georges Bank / Mid 11.7 +- 1.02 (57) 12.65 +- 0.44 (5) 9.52 - 13.71 12.14 - 13.21
SPRING Gulf of Maine / Northern Georges Bank 6.18 +- 0.62 (52) 6.89 +- 0.69 (5) 4.9 - 7.52 5.78 - 7.52
SPRING Outside stock area 6 +- 1.07 (52) 6.25 +- 1.16 (5) 4.54 - 9.69 5.53 - 8.29
SPRING Southern Georges Bank / Mid 7.88 +- 0.81 (52) 8.66 +- 0.69 (5) 5.82 - 9.73 8.06 - 9.73
SUMMER Gulf of Maine / Northern Georges Bank 7 +- 0.57 (6) 7.22 +- 0.63 (3) 6.47 - 7.8 6.55 - 7.8
SUMMER Outside stock area 8.88 +- 2.23 (6) 7.05 +- 1.34 (3) 5.56 - 11.22 5.56 - 8.15
SUMMER Southern Georges Bank / Mid 9.32 +- 0.57 (3) 9.32 +- 0.57 (3) 8.99 - 9.99 8.99 - 9.99
WINTER Gulf of Maine / Northern Georges Bank 5.97 +- NA (1) 5.97 +- NA (1) 5.97 - 5.97 5.97 - 5.97
WINTER Outside stock area 4.43 +- 0.82 (3) 4.43 +- 0.82 (3) 3.52 - 5.1 3.52 - 5.1
WINTER Southern Georges Bank / Mid 8.13 +- 1 (15) 7.82 +- 0.74 (5) 6.29 - 9.51 7.23 - 9.01
Data

Salinity

Surface and bottom salinity data were pulled from survdat.

Figures

Separate geom_gls() functions were fit for fall and spring measurements; trend lines are only shown when the trend was statistically significant, so some plots may have fewer than two trend lines. Fall has solid trend lines, and spring has dashed trend lines. Please note, sometimes the survey observed a small number of fish outside of the defined stock area.

Summary
Surface salinity
Season Region Mean value +- SD (n years) Mean value +- SD (past 5 years) Range (total) Range (past 5 years)
FALL Gulf of Maine / Northern Georges Bank 32.45 +- 0.29 (28) 32.6 +- 0.14 (5) 31.86 - 32.87 32.41 - 32.74
FALL Outside stock area 31.85 +- 0.43 (28) 32.12 +- 0.35 (5) 30.81 - 32.46 31.62 - 32.46
FALL Southern Georges Bank / Mid 32.84 +- 0.53 (28) 33.26 +- 0.54 (5) 31.66 - 33.87 32.47 - 33.73
SPRING Gulf of Maine / Northern Georges Bank 32.19 +- 0.31 (28) 32.22 +- 0.27 (5) 31.34 - 32.61 31.91 - 32.61
SPRING Outside stock area 31.38 +- 0.64 (28) 31.72 +- 0.66 (5) 30.16 - 32.45 30.75 - 32.44
SPRING Southern Georges Bank / Mid 33.03 +- 0.39 (28) 33.29 +- 0.41 (5) 32.21 - 33.89 32.77 - 33.89
SUMMER Gulf of Maine / Northern Georges Bank 31.81 +- 0.24 (3) 31.81 +- 0.24 (3) 31.55 - 32.03 31.55 - 32.03
SUMMER Outside stock area 31.15 +- 0.2 (3) 31.15 +- 0.2 (3) 30.93 - 31.3 30.93 - 31.3
WINTER Gulf of Maine / Northern Georges Bank 32.33 +- NA (1) 32.33 +- NA (1) 32.33 - 32.33 32.33 - 32.33
WINTER Outside stock area 31.64 +- 0.26 (3) 31.64 +- 0.26 (3) 31.34 - 31.85 31.34 - 31.85
WINTER Southern Georges Bank / Mid 33.21 +- 0.55 (15) 33.41 +- 0.62 (5) 32.45 - 34.07 32.69 - 34.07
Bottom salinity
Season Region Mean value +- SD (n years) Mean value +- SD (past 5 years) Range (total) Range (past 5 years)
FALL Gulf of Maine / Northern Georges Bank 33.63 +- 0.18 (28) 33.68 +- 0.14 (5) 33.25 - 33.98 33.46 - 33.82
FALL Outside stock area 32.46 +- 0.42 (28) 32.76 +- 0.56 (5) 31.74 - 33.39 31.94 - 33.39
FALL Southern Georges Bank / Mid 33.54 +- 0.39 (28) 33.73 +- 0.32 (5) 32.77 - 34.27 33.37 - 34
SPRING Gulf of Maine / Northern Georges Bank 33.5 +- 0.17 (28) 33.57 +- 0.09 (5) 33.04 - 33.93 33.43 - 33.69
SPRING Outside stock area 32.37 +- 0.5 (28) 32.64 +- 0.41 (5) 31.19 - 33.3 32.26 - 33.3
SPRING Southern Georges Bank / Mid 33.82 +- 0.33 (28) 34.04 +- 0.26 (5) 32.93 - 34.37 33.79 - 34.37
SUMMER Gulf of Maine / Northern Georges Bank 33.41 +- 0.39 (3) 33.41 +- 0.39 (3) 32.97 - 33.69 32.97 - 33.69
SUMMER Outside stock area 32.08 +- 0.46 (3) 32.08 +- 0.46 (3) 31.55 - 32.39 31.55 - 32.39
WINTER Gulf of Maine / Northern Georges Bank 33.49 +- NA (1) 33.49 +- NA (1) 33.49 - 33.49 33.49 - 33.49
WINTER Outside stock area 32.29 +- 0.25 (3) 32.29 +- 0.25 (3) 32.02 - 32.51 32.02 - 32.51
WINTER Southern Georges Bank / Mid 33.86 +- 0.44 (15) 34 +- 0.39 (5) 32.92 - 34.52 33.44 - 34.39
Data

Abundance

Abundance data were pulled from survdat and assessmentdata::stockAssessmentData.

Figures

Separate geom_gls() functions were fit for fall and spring measurements; trend lines are only shown when the trend was statistically significant, so some plots may have fewer than two trend lines. Fall has solid trend lines, and spring has dashed trend lines. Please note, sometimes the survey observed a small number of fish outside of the defined stock area.

Survey abundance (raw measurements):

Survey abundance (swept area estimates):

Please note, these estimates are not parsed by region or season. Swept area estimates are based on spring and fall surveys only. The shaded gray region indicates +/- two standard errors.

Assessment abundance:

## [1] "NO DATA"
Survey summary
Measured abundance
Season Region Mean value +- SD (n years) Mean value +- SD (past 5 years) Range (total) Range (past 5 years)
FALL Gulf of Maine / Northern Georges Bank 17,991.51 +- 26,275.45 (57) 65,849.2 +- 14,893.84 (5) 811 - 106,068 51,852 - 89,367
FALL Outside stock area 4,769.79 +- 6,716.4 (57) 17,654.4 +- 8,035.01 (5) 4 - 28,581 8,315 - 28,581
FALL Southern Georges Bank / Mid 9,586.53 +- 10,698.74 (57) 22,491.4 +- 20,775.52 (5) 707 - 56,155 3,005 - 56,155
SPRING Gulf of Maine / Northern Georges Bank 20,690.19 +- 34,004.41 (52) 66,580.6 +- 11,345.47 (5) 47 - 135,353 52,785 - 84,011
SPRING Outside stock area 4,350.58 +- 7,659.25 (53) 10,599 +- 6,580.35 (5) 30 - 44,401 1,345 - 19,489
SPRING Southern Georges Bank / Mid 9,011.62 +- 11,041.36 (53) 13,630 +- 6,320.7 (5) 686 - 46,967 8,210 - 23,492
SUMMER Gulf of Maine / Northern Georges Bank 1,816.17 +- 999.86 (6) 2,615.67 +- 661.44 (3) 761 - 3,365 2,113 - 3,365
SUMMER Outside stock area 693.67 +- 574.46 (6) 190.33 +- 17.21 (3) 178 - 1,487 178 - 210
SUMMER Southern Georges Bank / Mid 952.33 +- 101.49 (3) 952.33 +- 101.49 (3) 860 - 1,061 860 - 1,061
WINTER Gulf of Maine / Northern Georges Bank 1,697 +- NA (1) 1,697 +- NA (1) 1,697 - 1,697 1,697 - 1,697
WINTER Outside stock area 148.67 +- 138.48 (3) 148.67 +- 138.48 (3) 4 - 280 4 - 280
WINTER Southern Georges Bank / Mid 3,230 +- 2,020.91 (15) 3,731 +- 2,834.11 (5) 1,062 - 8,492 1,062 - 8,492
Data

Survey data (raw measurements):

Survey data (swept area estimates):

Assessment data:

Biomass

Biomass data were pulled from survdat.

Figures

Separate geom_gls() functions were fit for fall and spring measurements; trend lines are only shown when the trend was statistically significant, so some plots may have fewer than two trend lines. Fall has solid trend lines, and spring has dashed trend lines. Please note, sometimes the survey observed a small number of fish outside of the defined stock area.

Survey biomass (raw measurements):

Survey biomass (swept area estimates):

Please note, these estimates are not parsed by region or season. Swept area estimates are based on spring and fall surveys only. The shaded gray region indicates +/- two standard errors.

Assessment biomass:

Summary
Measured biomass
Season Region Mean value +- SD (n years) Mean value +- SD (past 5 years) Range (total) Range (past 5 years)
FALL Gulf of Maine / Northern Georges Bank 1,616.16 +- 2,230.63 (57) 5,978.47 +- 2,333.12 (5) 153.38 - 8,630.29 3,697.28 - 8,630.29
FALL Outside stock area 352.34 +- 621.28 (57) 1,590.84 +- 945.68 (5) 0.6 - 3,009.06 578.98 - 3,009.06
FALL Southern Georges Bank / Mid 403 +- 425.71 (57) 825.66 +- 564.02 (5) 56.6 - 2,030.2 182.56 - 1,548.61
SPRING Gulf of Maine / Northern Georges Bank 1,043.87 +- 1,632.16 (52) 4,485.84 +- 1,343.75 (5) 4.4 - 5,812.67 2,468.61 - 5,812.67
SPRING Outside stock area 253.51 +- 389.32 (53) 644.72 +- 636.03 (5) 1.2 - 1,520.1 30.57 - 1,364.87
SPRING Southern Georges Bank / Mid 856.88 +- 866.47 (53) 896.08 +- 157.62 (5) 55.77 - 3,637.47 733.19 - 1,152.69
SUMMER Gulf of Maine / Northern Georges Bank 212.03 +- 79.12 (6) 214.5 +- 38.19 (3) 98 - 334.9 192.3 - 258.6
SUMMER Outside stock area 81.52 +- 77.64 (6) 18.8 +- 7.73 (3) 13.1 - 208.2 13.1 - 27.6
SUMMER Southern Georges Bank / Mid 203.2 +- 21.87 (3) 203.2 +- 21.87 (3) 178.9 - 221.3 178.9 - 221.3
WINTER Gulf of Maine / Northern Georges Bank 45.7 +- NA (1) 45.7 +- NA (1) 45.7 - 45.7 45.7 - 45.7
WINTER Outside stock area 3.7 +- 2.97 (2) 3.7 +- 2.97 (2) 1.6 - 5.8 1.6 - 5.8
WINTER Southern Georges Bank / Mid 239.74 +- 129.23 (15) 171.63 +- 72.53 (5) 75.02 - 509.8 75.02 - 253.97
Data

Survey data (raw measurements):

Survey data (swept area estimates):

Assessment data:

Catch

Stock assessment catch data are from assessmentdata::stockAssessmentData. Recreational catch data were downloaded from NOAA MRIP. Commercial catch data were downloaded from NOAA FOSS.

Figures

Stock assessment catch:

Recreational catch:

Commercial catch:

Commercial vs recreational catch:

Data

Stock assessment catch:

Recreational catch:

Commercial catch:

Commercial vs recreational catch:

Length

Length data were pulled from survdat. Only years with more than 10 fish lengths were considered for analysis.

Figures

Separate geom_gls() functions were fit for the minimum, mean, and maximum lengths; trend lines are only shown when the trend was statistically significant, so some plots may have fewer than three trend lines. Please note, sometimes the survey observed a small number of fish outside of the defined stock area.

Summary
Season Region Mean value +- SD (n fish, n years) Mean value +- SD (n fish, past 5 years) Range (total) Range (past 5 years)
FALL Gulf of Maine / Northern Georges Bank 21.21 +- 7.54 (1,025,516, 57) 21.37 +- 7.59 (329,246, 5) 1 - 71 4 - 66
FALL Outside stock area 19.13 +- 8.3 (271,873, 56) 21.79 +- 6.88 (88,272, 5) 2 - 76 4 - 67
FALL Southern Georges Bank / Mid 13.39 +- 8.98 (546,432, 57) 13.4 +- 8.08 (112,457, 5) 1 - 64 3 - 49
SPRING Gulf of Maine / Northern Georges Bank 18.22 +- 5.72 (1,075,890, 52) 19.96 +- 6.49 (332,903, 5) 3 - 67 5 - 66
SPRING Outside stock area 16.96 +- 7.7 (230,569, 53) 17.31 +- 7.84 (52,995, 5) 2 - 73 5 - 61
SPRING Southern Georges Bank / Mid 21.75 +- 8.01 (477,616, 53) 18.89 +- 7.48 (68,150, 5) 2 - 78 3 - 50
SUMMER Gulf of Maine / Northern Georges Bank 23.21 +- 6.39 (8,564, 6) 21.74 +- 5.09 (6,791, 3) 4 - 63 4 - 50
SUMMER Outside stock area 23.82 +- 7.22 (2,312, 6) 22.3 +- 5.49 (388, 3) 10 - 53 12 - 50
SUMMER Southern Georges Bank / Mid 29.63 +- 7.37 (1,786, 3) 29.63 +- 7.37 (1,786, 3) 12 - 58 12 - 58
WINTER Gulf of Maine / Northern Georges Bank 15.98 +- 2.87 (1,433, 1) 15.98 +- 2.87 (1,433, 1) 11 - 28 11 - 28
WINTER Outside stock area 11.41 +- 4.52 (368, 2) 11.41 +- 4.52 (368, 2) 6 - 28 6 - 28
WINTER Southern Georges Bank / Mid 21.85 +- 7.23 (27,182, 15) 18.54 +- 7.41 (5,497, 5) 3 - 53 5 - 46
Data

Condition

Condition information comes from diet data; only regions and seasons with more than 10 fish observations were considered. We calculated a rough condition factor as: Weight / Length^3, and relative weight was previously calculated.

Figures

Length vs weight

Please note, no trend lines were fit, points are jittered to reduce overlap, and sometimes the survey observed a small number of fish outside of the defined stock area.

Condition factor: Weight-volume

If there were more than 30 years of data, a geom_gls() regression was fit. In order to fit the geom_gls() regression, we calculated the mean condition factor for each year and plotted the geom_gls() through those points. Please note, points are jittered to reduce overlap, and sometimes the survey observed a small number of fish outside of the defined stock area.

Condition factor: Relative weight

Please note, this data is aggregated by Ecological Protection Unit (EPU), which may differ slightly from the stock assessment regions.

Data

Length vs weight with weight-volume condition factor

Relative weight condition factor Please note, this data is aggregated by Ecological Protection Unit (EPU), which may differ slightly from the stock assessment regions.

Risk analysis

A preliminary risk analysis was conducted by ranking all species according to their indicator values. A high rank number and a normalized rank near 1 indicates that the species is at risk or of importance based on the measured indicator values. When a species was missing an indicator, it was assigned a normalized rank of 0.5.